Inovance SV670P Series - RS485 Communication Cable

Electrical Design Guide
‑43‑
3.4.2 RS485 Communication Cable
RS485 communication with PLC
The following figure shows the cable used for 485 communication between the servo
drive and PLC.
Figure 3‑23 Outline drawing of cable used for CAN communication between the servo drive
and PLC
Use a three‑conductor shielded cable to connect the RS485 bus, with three
conductors connected to 485+, 485‑, and GND (GND represents non‑isolated RS485
circuit) respectively. Connect RS485+ and RS485‑ with two conductors twisted
together and connect the remaining conductor to the RS485 reference ground (GND).
Connect the shield to the device ground (PE). Connect a 120Ω termination resistor on
each end of the bus to prevent RS485 signal reflection.
Table 3–11 Pin connection relation of the cable used for CAN communication between the
servo drive and PLC
RJ45 on the Drive Side (A) PLC Side (B)
Communica
tion Type
Pin No.
Description
Communica
tion Type
Pin No.
Description
RS485
4 485+
RS485
4 485+
5 485‑ 5 485‑
8 GND 8 GND
‑
Enclosure
PE (shield
layer)
‑
Enclosure
PE (shield
layer)
Wiring of multi-drive RS485 communication
The following figure shows the cable used for multi‑drive RS485 communication.
Figure 3‑24 Outline drawing of the cable used for multi‑drive RS485 communication